Device for cutting noncircular holes



Nov. 2, 1948. PAI-YEN LoUNG 2,453,025

DEVICE FOR CUTTING NoNcIRcULAR HOLES 'Filed March 25, 1948 A 2 Shee'ts-Sheet 1 PAI-YEN LOUNG' l 2,453,025 DEVICE FR GUTTING'NONCIRCULAR HOLES I Nov.. 2, 948.

2 Sheets-'Sheet 2 Filed March 25, 1948 in r TL-.1l

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l UNITED e STATE cam mechanism instead of the block.

Patented ov. .2, m48

S P TENTQFFICE- DEVICE rois CUTTING NoNcIRCULAn i HoLEs Pai Yen Loting,v New York, N. Y. Application March 25, 194s, seriaiNn. 16,965 `"i Claims. (Cl. 'T7-61) `'This invention relates to new and useful "im-""1 i provements in drilling tools and has especial reference toa drilling tool with which non-circular holes may be drilled or cut.

` The main object of theinvention is to provide l a simple, durablestrongand ecient device fort-fcutting non-circular holes. i i A further object is to provide a device'which 'is composed of a minimum number of simple parts "which canbe manufactured at `low cost and very,v

quickly and easilyassembled and disassembledfas" desired.

A still further object is to provide a simple device which, after once being started in its drill` ingoperation, will, when power operated, continue A115 working automatically with a minimum of attenlv i' "tion thereto required of the operator.

" "Further and more specific objects, features and advantages will more clearly appear from a consideration of the detailed specification hereinafter 2U set forth, especially when taken in connection "withthe accompanying drawings which illustrate present preferred forms which the invention may assume and which form part ofthe specification.

In brief and general terms, the invention in-V cludes `a drill shaft which maybe manually or" power driven on the lower end of which is disposed a circular drill of any suitable form. Osi `cillatalolyl mounted onthe shaft above the circular `drill is a hollow block having cutting teeth atits lower surface and means on the shaft within the blockto cooperate therewith to oscillate the block as the shaft is turned. The circular drill i on the lower end of the shaft drills a circular hole almost as large as the desired ultimate hole and t5 then the oscillating cutter subsequently 4descends following the lower drill and cuts off the corners of the `non--circular hole as may be desired.

The preferred present form which the `invention may assume is illustrated in the drawings ofwhich- Fig `1 is a Vertical cross section taken on the f Fig.` 2 isa vertical cross section takenyon the line 2-2 of Fig.3;

Fig. 3 is a horizontal cross section taken onm the line`3-3 of Fig. 1; Figs. 4 and 5 are similar sections showing the operating mechanism in different positions;"

Fig. 6 is a perspective View of the rotary drill `50 shaft and operating gear sector;

Fig. 'l is a perspective viewof onehalf of the oscillatable cutting block;

Fig. 8 is a section similar to Fig. 5 showing a Fig. 9 is an elevation of a modiedforrn of the device;

FigQlO is'a vertical cross section therethrough;`

and

desired;

f the gear racks shaft 4 iii is turned.

form in which the chamber has no gear teeth and e `with oppositely disposed` gears for oscillating Inter a liollowiblock `formed of two Similar halves I3 and It, Each half has a curved recess I5`to receive e the knob I2, when tted together, with upper and lower taperedchannels I6 anclll lead*` ing therefrom and allowing for the" swing of the block on the shaft to prevent binding. The lower` .channel ll opens into` a large central recess vor chamber la which in its walls opposite the open faces of the half sectionsis providedin one form with gear teeth i9. The halves are providedwith `bolt holes 20 to receive bolts' 2l which hold `the sections together. fThe bottom of each section tor 4half is provided with an elongated slot`22 atthe upper face of'which `there is a still wider recess `23 in which rides an elongated strip 24] which seals off the slot from the lower end of theshaft i so that chips from the cutting will not `get into andclog" the chamber i8 when the device is op- "erating` llhis strip 1s centrally apertured to surround the shaft lil.`

On` `the `shaft l'within the chamber 1811s formed a gear i9 to oscillate the block when the In Fig. Sthere is shown a the shaft` l0 is provided witha cam 26 instead of a gearsector. "Generally speaking the dimensions `of the two halveswhen placed together are equal direction to the width of the hole to be 1n ODE drilled and in the otherV direction are equal to "half the width of the hole although in its swing, as indicated in dotted lines in Fig. 3, the block Awill cover an area equal to the full area ofthe hole to be drilled.

The bottom of the `block sections are `pro-vided with-cutting teeth .'Z'l `which e are shown disposed in a curved manner with the center of theknob l2 as their center of curvature.

The stripZi also has a curvature centeringilon the knob l2and the block sections are provided s lits 28 `of the same dimensions as the cross section of the strip 24 `to allowthe block `to swing back `and forth while the strip remains stationary as shown in Fig. 2.

It is, of course, `also tobe` noted that a square will be cut bythe form shown in the drawings,

0 although it `can bejeasily irriagiried` how the plan.

e Fig. `llis a horizontal cross section taken on theiine ii-zll ofFig. 10.

new merely to the specific forms of theinvention shown in the drawings, it willbe "jediate its` ends the shaft l0 is preferably 'provided with a rounded protuberance l2 or knob, preferably integrallyformed thereon. Mounted on the shaft Ii) for oscillation in a straight lineis sector 25 which cooperates with I andslope farther away from each` other `as thereare formed upper and lower openings isprovidedzwith a cam arm i9 f the .surface after vwhich 'the' spirit and. scope thereof.

View section of the half sections may 4be changed in outer shape and curvature to out oval or similar non-circular .holesif desired. .f

In theloperation of the device, assuming that the block sections have been bolted together around the shaft l0, the lower pointed end iof` Y the circular drill is placed on the centerpoint of the hole to be cut. The upper end of the shaft y.

ner as by a brace or may be connected to the chuck of a drill motor for power operation. A s this operation proceeds, the lower drill cuts a round hole deeper and deeper into the ,surface and is closely followed by the oscillating cutter ,blockLthe teeth of which icut away ,thelremain- 'ing portions of the desired hole which have not l been, ,cutv ,by the ,refers particularly tothe corner areas or those v,aneasoutside'the circularsection of the lower` lowerdrill 4and this ofcourse drill. Y Themodified form comprises U-shapedplates A|3',.a11d I4. connectedby bolts 2l"to form .ahollow.block, but in` this case the knob l2 is in the middle of the block where the inner walls thereof approach each other and are provided with suita- "blyshaped recesses l5. to receive the knob. lIhe inner .faces ofthe plates are sloped `away from [each other as indicated at I6' and Il .being faces nearer to each other at the middle of their Thus which permitv the block to oscillate around lthe knob I2 ina manner similar to the previously described reach the top and bottom of each plate.

form.,A The bottom of the block is provided with.l and the lower sides of the plates I3 `the slot 22 provided with lateral openings i8, I8 topermit the escape of .chips therethrough. This lconstructionis somewhat simpler' and cheaper to manufacture than the previous form but `essen-v tially it operates in substantially the same Inanner. Inthisform the shaft l@ ,abovethe knob l2 which lin. rotation contaits the inner ,walls 'of the plates fl-3', an'dUM and causethe oscillation of the block.

Thisldevice is very easy to handle .because of its... extremely simple constructio-nand minimum After the device issi-arted into number ofV parts.

thesurface the cutting may take vplace almost` automatically with lpractically no attention on thex..pa'r`t ofthe operator especiallywhenthe devicegis motor-driven. `The device `.must beheld -injposition until `the' block commences .-to cut in to it will maintain itsrelf,f,fin Since most of the work. in operating .the device is taken bythe lower drill,

the, right position.

asthe -block merely cutsaway the corners and surplus areas not cut by the lower drill'the,b1oc k needs less power than the main drill and there Lfore may be driven by the cam if desired instead .of by the gears shown, Which drive is. employed will .depend largely and naturally upon the na- .ture of the material being drilled,

. While .the invention has tail, and shown with respect to theaccompanying drawing, it is not to be limited to such `'details,1since many changes and modifications may be made rin the invention without departing from Hence, it isdesired tocover any and all forms` and modifications-of thel invention which mayy come within the .language andseope Aof .any one or `more of .the Iappended claims.A

A-Whatilclaimas myinventionis: A 1. A drilling device which rincludes a rotatable .they i 3 30 been described in del may then be turned manually in any usual manshaft having a circular drill at its lower end, an

oscillatable hollow block mounted on the shaft, and'means orrthe shaft and withinfthe block to oscillate theblock as cthelshaft is turned, and cutting teeth on the lower face of the block.

42. A drilling device which includes a rotatable shaft havingacircular drill at its lower end and a protuberanceintermediate its ends, a sectional 'hollow block embracing said shaft and swivelled aroundfsaiol.protuberance for oscillatory motion,l

.shafafacircular drillat its `lower enda .sectional hollowhlook surroundingthe shaft with itslower face ,'ustaboveithe drill, teeth. `on ,the,lower,face of the block, means for swivelling the blockmn .the. shaft for; oscillatory movement,-and cooperatingmeans Von the shaft and the block .andfdis- .posed within .the.block.remediatethe'biockasthe shaft is.L turned.

5.` A drilling :device which includes .arotatable shafts:a'circulandrill on the lower endthereof, a

shaft intermediate vits, length, v .shaft between theprotuber- .ance andthe drill, a sectionalfblockadaptedtocbe disposed .around the'shaft and havinglaarecessnto .receive:saidwprotuberance Aso Vthat Athe lblock-may .oscillateon theshaftfsaid block having achamberlin which vlies said gear sectorand Zaal-bottom elongatedslot-through which extends said shaft, racks onfoppositesides `of said lchamber-.tolcoact p rotuberanceon the ai gear.` sector on` the with .said seotorlto.osci=llate fthe..block., teethcn Sandman;

the y.lower .fa-ce .of .said block, a strip Vapertured to `ernbralse,said .shaft and Adisposed in, said chamber .above .saidslotitosealthe `slitsairr,opposite ,walls thereof to receivethe ends e of l the l strip and permit same, said ,block :having Y osciliaupngof. the block while-.sealing sa'dyslot` V y Y o..` A ,drillingf device Vwhich includes afrotatable `shafta circular drill onits ,lowerend, afvsectional diaaent lhojllow block v.surrounding `said shaft, vlhe; g i walls.y tof; the sections ,being xrelatively .l divergent from 4fthe' middle yof each, section to orm, openings .--therebetween a knob Ion 1 the shaft, .said sections having recesses at their mid portions.to,receive and means-on the? f shaft l.andflyills in one of said openings to engage the wallsof tlie block.

l sections, .as the shaft :is rotated and .oscillate @said urroundingsaidshaft, theadjacent walls Vof rthe ,sections- :beingrelatively divergent y each.sectiontoaformV openings fromjthermiddle ,of therebetween, a knob on the .s'haft, ,said A,sections having recesses iat their mideportions I:to receive the knob, and a cam arm .on theshaftandlying intheopeningin `the block above said knob .t0-,eri-

lgagethe .walls ofsaidopening ,to `engage thev Walls of the said sections as the shaft is rotatedand i oscillatesaidblock, l

PALXEJN. Lorne.

No references cited. Y

` 7..A,.drilling-.,devicefwhichfincludesfa rotatable .i shaft, a circular drillon its lower endassectional T V.hollow-block, 

